class Sample4_5
{
public static void main(String[] args) {
		int i=0;
		while(i<10) {
		
			int j=0;
			
                 while(j<i) {
		                  		
			System.out.print(j);
			
                   j++;}
		        
			System.out.println(i);
			i++;

}
	}
}	              
 
